Exhibit 31.3
CERTIFICATION
I, Jack Lief, certify that:
1. | I have reviewed this Amendment No. 1 on Form 10-K/A of Arena Pharmaceuticals, Inc., or Amendment; and |
2. | Based on my knowledge, this Amendment does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this Amendment. |
Date: April 28, 2009 | ||
/s/ JACK LIEF Jack Lief, President and Chief Executive Officer |